Gravitating door check and closer



(NoModel.) l 2 sheets-sheet 1. Y v H. F. SHAW.

I 'CRAVITATINC DOOR CHECK AND CLOSER.

N0. 36`5.491. Pa-tentedJ-une 28, 1.887.v Y

(No Model.) 2. Sheets-Sheet 2.

Y H. F. SHAW. v

CRAVITATINC DCCR CHECK AND CLOSER. No. 365,491. Patented June 28, 1887'.

vgla? l H54. INJENTDR' UNITED STATES PATENT' Orrlcng HNRY F.`SHAw, or BoSToN, MASSACHUSETTS.

VGRAVITATING DOOR CHECK AND CLOSER.

SPECIFICATION forming part of Letters Patent No. 365,491, dated June 28, 1887.

' Application filed April 27, 1887. Serial No. 236,357. (No model.)

T0 all whom/ it may concern:

BeV it known that I, HENRY F. SHAW, of Boston, in the county of Suffolk and State of Massachusetts, have invented a new and useful Improvement in Door-Checks, of which the following, taken in connection with the accompanying drawings, is a specification.

My invention relates to that class of doorclosing attachments which while closing vthe door promptly check its motion to prevent slamming.

The object of this invention is to provide a simple, durable, and inexpensive article, not liable to get out of order, as do those which act by pneumatic pressure, and at the same time easily attachable, andwhen the door is swung back acting as a weight to hold it open. I attain these lobjects by the mechanism illustrated in the accompanying drawings, in which- Figure 1 is an elevation of the doorcheck attached to the door, represented as closed. Fig. 2 is a plan of the same. Fig. 3 is an elevation showing the door in the position when checked in its closing motion-that is, when nearly closed, Fig. 4 being a'plan of the same; and Fig. 5 is an enlarged section of a detail of the same. y V

P represents the door hung to the casing P in the ordinary manner, and actuated by a closing-spring P2 of any desired pattern. rllhe doorcheck is attached to the door by the bracket A and to the casing by the bracket B, each bracket having a socket, a or b, into which the pivotal pins A and B are dropped but not fastened, thereby allowing an easy detachment of the door-check. These pivotal pins are connected at their upper ends to the actuating mechanism by means of swinging arms A2 B2, and through them the motion of the dooracts on and is governed by the check. Aexible steel ro'd, D, is secured on the arm A2, and asegment, D', has its center at the pivot D2, which pivot is fixed in the slotted arm E. The segment D has a notch, D2, in its periphery. A bent'lever, E', is pivoted upon the slotted arm E at E2, having a projection, E2, Fig. 5, which engages with the notch D3 on the segment-piece D. The arm E is provided with 5o a cross-arm E2, (see Figs. 1, 3, and 5,) to which is fastened atE and E5 two steel rods, E2 and F18, having their other ends fastened in a similar manner to the cross-arm F at F and F2. The upper rod, E2, is provided with elastic stops G and G2. The cross-arm F is connected by the swinging arm B2 to the pin B. The actuating frame being pivoted at A2 B2, and having ajoint at D2, forms a toggle-joint having its center at D2, and as a wholev swinging with the door. Between the rods E2 and E2 is placed a rolling weight, G, grooved on its periphery and rolling on the rod E2, the rod E2 acting as its guide to keep it perpendicular. The opening of the door shortens the distance between the bearings A2 and B2, and thus elevates the center of the toggle, whereby the weight G is by gravity rolled backward against the elastic stop G2. When properly affixed to the door and casing, the brackets must have such a relative height as will cause the weight G to rolltoward the center pivot,

D2, when the door is about four inches open.

This elastic stop G2 is Xed on the rod E2 by the movable collar and Setscrew G2, the purpose of which will be explained farther on. When the weight G is rolled backward from the center, the lever E drops by gravity, and the tooth E2 thereby engages with the notch D3 in the segment D', Fig. 5, thus preventing the segment D from turning, thereby holding the' joint D2 rigidly. The rods D F8 .F7 and connecting parts then become as a single bent rod, with an angle at D2, and any further motion of the door tends to straighten the angle and lengthen the distance between A2 and B2.

Vhen the door is within about four inches of closing, were all the 'parts rigid the door would come to a dead Stop; but the resilience of the rod D allows considerable more closing motion to take place, and then draws back (toward opening) the door with a rebound.

The weight G in the meantime rolls forward against the lever E and raises it, unlatching the projection E2 and allowing the joint D2 to straighten and the door to gently close. To do this properly the set-screw G3 is set at such a point as to time the motion of the weight and to meet the rebound of the door when the lever is being raised. The weight then acts on the togglejoint to supplement the action IOO of the spring() in closing the door, which always occurs when thc parts are properly adjusted.

I elainl 5 1. In a door-cheek, the combination of the pivotal joint B B2, frame F E7 E 5 E4, and arm E, with rolling Weight G, lever E','having a projection, E, the segment D, having a notch, D, the resilient rod D, and the pivotal joint 1o A2 A', all operating together, substantiallyas drscrbed, and for the purpose set forth.

2. In a door-cheek, the combination of a weight-guiding frame F E7 E" E with a mechanism for connecting the same to a resilient rod, D, and the resilient rod D, all arranged I5 to operate substantially as described, and for the purpose set forth.

HENRY F. SHAW.

Witnesses:

FRANK G. PARKER, WM. A. WILSON. 

